Out of the box RHQ was monitoring the number of rows in a certain Drupal table we usually suspect,  Drupal was slow and yeah I was able to at least acknowledge that yeah there was a spike in the trending but it resolved... without any extra effort.   How much effort to set up nagios/other with trending and graphs?  saltstack mysql module doesn't have table-level visibility,  would be custom scripting/setup even leveraging salt.  Drupal is not even a RHQ use-case I imagine